Table 1 The common mathematical notation used in this paper.

From: Integrated metaheuristic algorithms with extreme learning machine models for river streamflow prediction

Symbol

Meaning

\(X^{t}\)

Position of solution at the \(t\,th\) iteration (generation/epoch)

\(X_{i, j}^{t}\)

The value of the \(j\,th\) dimension of \(i\,th\) solution at the \(t\,th\) iteration

\(X_{r}\)

The random solution (position)

\(T_{max}\)

The maximum number of iterations

\(X_{best}^{g}\)

The current best solution at \(g\,th\) generation

\(X_{best}\)

The global best solution (The final solution of algorithm)

\(fit_{best}^{t}\)

The current best fitness value at \(t\,th\) generation

\(fit_{best}\)

The global best fitness value

\(g\), \(g_{max}\)

The current generation and maximum number of generations

\(randn\)

The random number generated from normal distribution